<template>
    <div>
        <!--面包屑导航-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图-->
        <el-card>
            <!--提示区域-->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!--步骤条区域-->
            <el-steps align-center :active="parseInt(activeIndex)">
                <el-step title="基本信息" ></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <el-form :model="addForm" :rules="rules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs @tab-click="tabClicked" :before-leave="beforeTabLeave" v-model="activeIndex" :tab-position="'left'" >
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input type="number" v-model="addForm.goods_price"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input type="number" v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input type="number" v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader expand-trigger="hover" :options="cateList" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange" >

                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="manyTableDataCopy[i-1].attr_name" v-for="i in manyTableDataCopy.length" :key="manyTableDataCopy[i-1].attr_id">
                            <el-checkbox-group v-model="manyTableData[i-1].attr_vals">
                                <el-checkbox border v-for="cb in manyTableDataCopy[i-1].attr_vals" :key="cb" :label="cb"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headersObj" :on-success="handleSuccess">
                            <el-button type="primary" size="small">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce">

                        </quill-editor>
                        <el-button @click="add" type="primary" class="btnAdd">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>

        </el-card>
        <!--图片预览-->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
    import _ from 'lodash'
    export default {
        name: "Add",
        created(){
            this.getCateList();
        },
        data(){
            return{
                activeIndex: '0',
                addForm:{
                    goods_name:'',
                    goods_price:'',
                    goods_weight:'',
                    goods_number:'',
                    goods_cat:[],
                    pics:[],  // 图片数组
                    goods_introduce:'',
                    attrs:[],  // 动态参数和静态属性
                },
                rules:{
                    goods_name:[
                        {required:true, message:'请输入商品名称',trigger:'blur'},
                    ],
                    goods_price:[
                        {required:true, message:'请输入商品价格',trigger:'blur'},
                    ],
                    goods_weight:[
                        {required:true, message:'请输入商品重量',trigger:'blur'},
                    ],
                    goods_number:[
                        {required:true, message:'请输入商品数量',trigger:'blur'},
                    ],
                    goods_cat:[
                        {required:true, message:'请选择商品分类',trigger:'blur'},
                    ]
                },
                cateList:[],
                total:0,
                cateProps:{
                    label:'cat_name',
                    value:'cat_id',
                    children:'children'
                },
                manyTableData:[], // 动态参数列表数据
                manyTableDataCopy:[],
                onlyTableData:[], // 静态属性列表数据
                uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',  // 上传图片的 URL 地址
                headersObj:{
                    Authorization: window.sessionStorage.getItem('token'),
                },
                previewPath:'',
                previewVisible:false,
                flag_1:true,
                flag_2:true,
            }
        },
        methods:{
            // 获取商品分类数据
            async getCateList(){
                const {data:res} = await this.$http.get('categories');
                if(res.meta.status!==200){
                    return this.$message.error('获取商品分类失败');
                }
                this.cateList=res.data;
                this.total = res.data.total;
                console.log(res.data);
            },
            handleChange(){
                console.log(this.addForm.goods_cat);
                // 只允许选中三级分类
                if(this.addForm.goods_cat.length!==3){
                    this.addForm.goods_cat=[];
                }
            },
            beforeTabLeave(activeName,oldActiveName){
                if(oldActiveName==='0' && this.addForm.goods_cat.length!==3){
                    this.$message.error('请先选择商品分类')
                    return false;  // 阻止标签页切换
                }
            },
            async tabClicked(){
                if(this.activeIndex === '1' && this.flag_1){
                    const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`, {params:{sel:'many'}});
                    if(res.meta.status!==200){
                        return this.$message.error('获取动态参数列表失败');
                    }
                    this.manyTableData = res.data;
                    res.data.forEach(item=>{
                        if(item.attr_vals.length===0){
                            item.attr_vals=[];
                        }
                        item.attr_vals=item.attr_vals.split(' ');
                    });
                    this.flag_1=false;
                    this.manyTableDataCopy=_.cloneDeep(this.manyTableData);
                }else if(this.activeIndex==='2' && this.flag_2){
                    const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`, {params:{sel:'only'}});
                    if(res.meta.status!==200){
                        return this.$message.error('获取静态属性失败');
                    }
                    this.onlyTableData=res.data;
                    this.flag_2=false;
                    this.onlyTableDataCopy=_.cloneDeep(this.onlyTableData);
                }
            },
            // 处理图片预览效果
            handlePreview(file){
                console.log(file);
                this.previewPath=file.response.data.url;
                this.previewVisible=true;
            },
            // 处理移除图片的操作
            handleRemove(file){
                // 1. 获取图片的临时路径
                const filePath=file.response.data.tmp_path;
                // 2. 从pics 数组中，找到这个图片的索引值
                const index=this.addForm.pics.findIndex(x=>{
                    return x.pic === filePath;
                });
                this.addForm.pics.splice(index,1);
            },
            // 在上传图片成功时，获取图片路径
            handleSuccess(response){
                console.log(response);
                // 1. 拼接得到一个图片信息对象
                const picInfo = {pic:response.data.tmp_path};
                // 2. 将对象 push 到 pic 数组中
                this.addForm.pics.push(picInfo);
            },
            add(){
                this.$refs.addFormRef.validate(
                    async valid =>{
                        if(!valid){
                            return this.$message.error('请填写必要的表单项');
                        }
                        // 添加商品
                        // lodash  cloneDeep(ojb)
                        const form=_.cloneDeep(this.addForm);
                        form.goods_cat= form.goods_cat.join(',');
                        this.manyTableData.forEach(item=>{
                            const newInfo ={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')};
                            this.addForm.attrs.push(newInfo);
                        });
                        this.onlyTableData.forEach(item=>{
                            const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals};
                            this.addForm.attrs.push(newInfo);
                        });
                        form.attrs=this.addForm.attrs;

                        // 发起添加商品请求
                        const {data:res}=await this.$http.post('goods',form);
                        if(res.meta.status!==201){
                            return this.$message.error('添加商品失败');
                        }
                        this.$message.success('添加商品成功');
                        await this.$router.push('/home/goods');
                    }

                )
            }
        },
        computed:{
            cateId(){
                if(this.addForm.goods_cat.length===3){
                    return this.addForm.goods_cat[2];
                }
                return null;
            }
        }
    }
</script>

<style scoped>
.el-checkbox{
    margin: 0 5px 0 0 !important;
}
    .previewImg{
        width: 100%;
    }

    .btnAdd{
        margin-top: 12px;
    }

</style>